GODRIVER-3145 Don't retry on context timeout or cancellation.

Author: matthewdale

x/mongo/driver/errors.go

@@ -294,6 +294,10 @@ func (e Error) HasErrorLabel(label string) bool {
 
 // RetryableRead returns true if the error is retryable for a read operation
 func (e Error) RetryableRead() bool {
+	// TODO: Comment? Testing?
+	if errors.Is(e, context.Canceled) || errors.Is(e, context.DeadlineExceeded) {
+		return false
+	}
 	for _, label := range e.Labels {
 		if label == NetworkError {
 			return true